@article{TMF_2018_195_1_a6,
     author = {A. M. Bikchentaev},
     title = {Differences of idempotents in $C^*$-algebras and the~quantum {Hall} effect},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {75--80},
     publisher = {mathdoc},
     volume = {195},
     number = {1},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2018_195_1_a6/}
}